AHT Cooling Systems E06 Error Code
Fault in high-pressure sensor E07 Fault in compressor safety chain E08 Fault in
Source: vento-spi__aht-vento-iom.pdf
What does AHT Cooling Systems E06 mean?
The control board reports a fault in the high-pressure sensor. This transducer measures refrigerant pressure on the high-pressure (discharge) side of the compressor. A failed sensor, broken wire, or out-of-range signal triggers E06, preventing the controller from monitoring condensing pressure and protecting the compressor from high-pressure conditions.
Symptoms
- E06 displayed with red LED and audible buzzer.
- High-pressure monitoring disabled; compressor protection relies on mechanical pressure switch only.
- Compressor operation continues but without electronic high-side pressure control.
- Cabinet temperature may become unstable.
Common causes
- High-pressure sensor transducer failed (open-circuit, short-circuit, or stuck reading).
- Wiring between sensor and control board damaged or connector loose.
- Sensor Schrader port leak causing refrigerant loss and incorrect pressure reading.
- Control board input channel for high-pressure sensor faulty.
- Connector corrosion from moisture ingress in the machinery compartment.
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Diagnostic steps
Move goods and record the fault
Transfer perishable goods to another appropriately rated cabinet. Note the device type and serial number.
Inspect sensor wiring
Check the cable and connector between the high-pressure sensor and the control board for damage, corrosion, or loose pins. Reseat connections.
Check sensor voltage output
With a multimeter, verify the sensor supply voltage and output signal voltage are within the range specified in the AHT service manual. An out-of-range output confirms sensor failure.
Inspect sensor fitting for leaks
Check the Schrader fitting or sensor port for refrigerant leaks using a leak detector. Do not open the refrigerant circuit without proper recovery equipment.
Replace the sensor
Fit an AHT-approved high-pressure transducer. Refrigerant recovery and recharge may be required if the circuit must be opened.
Restore power and verify
Confirm E06 is cleared after sensor replacement. Allow 2 hours of stable operation before reloading goods.
When to call a professional
High-pressure sensor replacement on pressurized refrigerant lines must be performed by an AHT-authorized technician certified for the applicable refrigerant (R-290 flammable or R-134a). Contact AHT service at 00800/73783248 or www.aht.at/service.
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Other AHT Cooling Systems Error Codes
Fault in electronic expansion valve E01 Fault in suction pressure sensor E02 Fau
Fault in air intake sensor E04 Fault in air outlet sensor E05 Fault in slat sens
Fault in internal temperature sensor (Goods room) E10 Supply voltage too low/too
Low battery voltage (see → Chapter 10.2.3) E12 Fault in software class B (safety
Fault in EEPROM (control board defective) E32 Suction pressure too low E33 Super
Superheating too high E35 Internal temperature too high (goods room) E36 Interna
Control temperature too low E38 Control temperature too high E39 Run-time fault
Fault in internal memory E41 Heating gas temperature too high (pressure tube sen
Time-out Valve opening 100% E43 Condensation pressure too high E44 External alar
E03 E04 E05 E06 E07 Falha no sensor de temperatura do gas de succao (sensor do c
compressor Falha no sensor de temperatura do pressao) E10 E09 gas térmico (senso
E34 E35 (software de seguranca) Pressao de aspiracao demasiado baixa Sobreaqueci
Sources: www.aht.at